Lighting device



FIG. 1 is a perspective view of a lighting device showing the new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

Any broken line(s) shown are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a lighting device, as shown and described. 